Multisite blog converting categories to subdomains

Having http://site.com/category/xyz = http://xyz.site.com/

I would like to move the content from each category to its equivalent subdomain blog, so that when I will access http://site.com/new-post/, where the post belongs to category XYZ, site.com will do a 301 redirect to http://xyz.site.com/new-post/

So, is there any other way besides then the hardcore extracting data from database and move it to its new place?

It’s very simple:

1. download and install this plugin: WP-Universe
   

   WP-Universe creates a blog universe based on categories of a WordPress blog.

2. go to Manage Category
3. edit the category description with the category subdomain (check the install guide)
   http://cat-slug.example.com/
4. now make your subdomains

et voilà